freezeburn

Freeze what you actually use.

Generate requirements.txt from real imports + installed packages.

Install

pip install freezeburn

Usage

freezeburn                      # Scan current directory
freezeburn /path/to/project     # Scan specific directory
freezeburn -o requirements.txt  # Custom output file
freezeburn -q                   # Suppress warnings

What It Does

Scans .py files (respects .gitignore and .reqignore)
Extracts imports via AST
Detects stdlib dynamically (sys.stdlib_module_names)
Intersects with installed packages
Outputs exact pinned versions

Ignore Files

Create .reqignore for freezeburn-specific exclusions:

tests/
scripts/
examples/*.py

Uses gitignore syntax. .gitignore is also respected.

How It Works

Imports (AST)  +  Installed (env)  =  requirements.txt
     |                  |                    |
   flask              flask==2.3.2      flask==2.3.2
   requests           requests==2.31    requests==2.31
   mymodule           (not installed)   (skipped + warning)
   os                 (stdlib)          (skipped)

Requirements

Python 3.10+
Activated virtualenv with your dependencies

License

GPL-3.0

Metadata

Release files for freezeburn 0.6.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for freezeburn 0.6.0
File	Size	Uploaded
freezeburn-0.6.0.tar.gz	23.4 kB	Jan 19, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for freezeburn 0.6.0
File	Interpreter	ABI	Platform	Reset
freezeburn-0.6.0-py3-none-any.whl 24.3 kB Jan 19, 2026	Python 3	none	any	Details

Total release size: 47.6 kB

Release files / freezeburn-0.6.0.tar.gz

Download URL	freezeburn-0.6.0.tar.gz
Size	23.4 kB
Tags	Source
SHA-256 checksum How to use checksums	`b9d81f190ebef1498daee8121acedb8dcbfd8f280272f30313652ff14d888784`
BLAKE2b-256 checksum How to use checksums	`0b01ecdcb488d5015a502d05e1603208ced8250a95fcfc31431b6dc8714bb622`
Upload date	Jan 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.12.3`

Release files / freezeburn-0.6.0-py3-none-any.whl

Download URL	freezeburn-0.6.0-py3-none-any.whl
Size	24.3 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`3534d18b17b15d854a219bd8fd60fc89f9227cc2e28567b3ec365ea09be21bf0`
BLAKE2b-256 checksum How to use checksums	`00ba464cdf451a92e02692b0765c1227ef6adf137d0813c5123ad5db2da87753`
Upload date	Jan 19, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.12.3`